The delivery service has another way to make money from its restaurants: it accepts higher commission rates from restaurants in exchange for better placement in the rankings, its filing reveals.

“As our two-sided network of restaurants and diners has grown, many of our restaurants have chosen to pay higher rates to receive better exposure to more diners on our platform, and this has resulted in higher overall commission rates for us,” the filing says.

That means that restaurants hoping to make more profit from more GrubHub orders might see their net gain shrink if they’re forced to pay more in order to stay on the higher side of restaurant rankings.